What is a chalk stream, how do they work, and what makes them so special?
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Chalk streams are fed by spring water, provided by the underground aquifer. The streams are famously ‘gin-clear’, with clean gravel river beds and good growth of aquatic plants like water crowfoot. The undeground source ensures a near constant temperature year round. This, along with the high mineral content, helps them to support a huge diversity of life.
Chalk streams follow an annual cycle with sections, or sometimes whole streams, drying up in late summer / autumn. Watch our film to learn more about how these fascinating ecosystems work.